Heat exchanger



Oct. 15, 1940. A. RHODES 2,218,097

HEAT EXCHANGER Filed March 22, 1959 11v VENTOR LEE A. 19/100155 ZTTORNZPPatented Oct. 15, 1940 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to a heat exchanger.

An object of the invention is to provide a heat exchanger of thecharacter described specially designed to adapt it for connection into awater line leading to a boiler and the exhaust steam lines from thesteam engine and slush pump of a well drilling' rig whereby the exhauststeam from the pump and engine may be utilized for preheating the waterentering the boiler; however, it is to be understood that while thedevice has been primarily designed for use in connection with a welldrilling rig it is adapted for use for analogous purposes.

Another object of the invention is to provide outer and inner enclosedwater chambers connected into the water line with an intermediate steamchamber connected into the exhaust steam lines so constructed as tofacilitate heat exchange between the steam and the water whereby thetemperature of the latter will be raised and the heat from the exhauststeam thus utilized.

In one embodiment of the invention the water in the inner water chambermay be circulated through tubes, provision being made for circulatingthe steam from the steam chamber about said tubes. In both forms of theinvention provision is made allowing the free circulation of waterbetween the water chambers.

With the above and other objects in view the invention has particularrelation to certain novel features of construction, operation andarrangement of parts, examples of which are given in this specificationand illustrated in the accompany drawing, wherein:

Figure 1 shows a diagrammatic plan view of a well drilling rig embodyingthe invention.

Figure 2 shows a longitudinal, sectional view of the heat exchanger.

Figure 3 shows a longitudinal, sectional view of another embodiment, and

Figure 4 shows a cross-sectional view taken on the line 4--4 of Figure3.

Referring now more particularly to the drawing wherein like numerals ofreference designate the same parts in each of the figures, the numeral ldesignates the derrick as a whole, of a well drilling rig, and mountedon the floor of the derrick is the steam engine 2 having the exhauststeam pipe 3 leading therefrom. The numeral 4 designates the slush pumpwhereby the drilling fluid used in well drilling is forced downwardlyinto the drill in the well in the usual way, said slush pump being steamdriven and having the exhaust steam line 5.

The numeral 6 designates a battery of boilers for generating therequired steam associated with which is the feed water pump 1 whichtakes water through the supply line 8 from a suitable source.

The numeral 9 designates the outer jacket of 5 the heat exchanger andentering one end of this jacket is the water delivery line 8a leadingfrom the pump 7 and the return water line l0 leads from the other end ofthe jacket and delivers the water to the boiler chambers so that the 10water from the supply line circulates through the jacket on its way tothe chambers of the boilers. Within the jacket and spaced from the wallsthereof there is an outer cylinder I l whose ends are bolted to the endsof the jacket as shown 1 in Figures 2 and 3 and within, and spaced from,the outer cylinder ll, all the way around there is the inner cylinder l2as shown in Figure 2 or In as shown in Figure 3. The inner cylinder isanchored to and maintained in spaced relation 20 relative to the outercylinder by means of the tubular stays, or anchors, l3 which, beingtubular aiford communication between the outer water chamber I4 aroundthe outer cylinder and the inner chamber l5 of Figure 2, or l5a ofFigures 3 25 and 4. The exhaust steam from the engine 2 enters the steamchamber it between the outer and inner cylinders through theT-connection H, at one end of the jacket and circulates through saidchamber l6 and is discharged through the outlet connection l8 at theother end of the heat exchanger.

The exhaust steam from the slush pump 4 will enter the steam chamberthrough the exhaust steam line 5. The steam circulating through thechamber IE will be surrounded by a portion of the water to be heated inthe chamber l4 and will surround a portion of the water to be heated inthe chamber l5 so that a maximum area of the water passing through thejacket will be exposed 40 to the surfaces of the cylinders ll, I2, orl2a, heated by the steam. In the embodiment shown in Figure 3 the innercylinder l2a. is provided with transverse partition plates I9, l9 spacedinwardly from the ends thereof and a series of 45 tubes 20 have theirends anchored to said plates so that the water may circulate throughsaid tubes. In this embodiment the inner cylinder lZa is provided with aplurality of openings l2b to permit steam from the chamber Hi to cir- 60culate about the tubes 20 to provide additional heating surfaces for thewater flowing through the inner cylinder.

The drawing and description disclose what are now considered to bepreferred forms of the in- 55 vention by way of illustration only, whilethe broad principle oi the invention will be defined by the appendedclaim.

What I claim is:

A heat exchanger comprising a closed elongated cylindrical outer sheetmetal Jacket having an inlet at one end and an outlet at the other end,an outer cylinder arranged concentrically within the jacket andextending approximately to the ends thereof forming an outer chamberbetween the Jacket and outer cylinder, said outer cylinder having anoutlet at one end and an inlet at the other end, an inner cylinderwithin the fluid between the outer chamber and the ends 6 of the innercylinder for circulation through the tubes, said inner cylinder beingperforated adjacent the tubes so that fluid within the outer cylindermay circulate about the tubes as it travels from the outer cylinderinlet to the outer cylinder 10 outlet.

LEE A. RHODES.

